sibley



Y(No Model.)

C. C. SIBLEY.

INSULATED CONDUCTOR.

No. 885,576. Patented July 3, 1888.`

W/T/VESSES:

N. Pmcns, vhow-Lmmgmpm. wmmgmn. n. c.

CLARENCE C. SIBLEY, OE NEW YORK, N. Y., ASSIGNOE TO THE SPLTDOEF WIRE COMPANY, 0F SAME PLACE.

iNSULATEDvCQNUCTUR.

SPECIFICATION forming part of Letters Patent No. 385,576, dated July 3, 1888.

Application filed January 2R, 1888.

To @ZZ whom, it 77u13/ concern:

Be it known that l, CLARENCE C. SIBLEY, a resident of the city, county, and Sate of New York, have invented an Improved insulated Conductor, ot' which the following is a speci iiration.

The object of my invention is to provide an electrical conductor with an insulation that shall be fire-proof, and that will also prevent moisture reaching the conductor.

The invention consists in a conductor having a covering of rubber or analogous substance and an additional covering of asbesus fibers. The asbestus fibers Aform a noncombustible insulation, while the rubber covering prevents moisture passing to the conductor. The conductor may also have other coverings oi' cotton, silk, or the like, all as more fully hereinafter set forth.

Reference is to be had to the accompanying drawings, forming part of this spcciiication, in Which- Figure l is a side view of an insulated conductor embodying my improvements; and Fig. 2 is a cross-section on the line o c, Eig. l.

- In the accompanying drawings, the letter A represents a metallic conductor. ln this instance it is shown as a piece o f tinseL which combines strength with great flexibility; but the conductor A may be of any approved form.

a is a covering or insulation of cotton or the like, placed as a tubular braid directly upon the conductor A, but this covering a is not essential.

E is covering of rubber or analogous substance plaeed over the conductor or over the first covering, a. ln applying this rubber cov ering I prefer to use a thin narrow continuous strip of rubber that resembles tape llhis rubber tape is Wound around the conductor A so as to overlap on its edges. These overlapping edges will adhere together when the rubber is of proper consistency, thereby forming a completely water-proofcovering; but the rubber covering B may be applied in any desired manner and form.

D is a covering or insulation ot' asbestus bers. These iibers l) of asbestus I apply in the forni of a thread or cord. rllhe fibers are iirst untwisted and then spread and ilattened into a thin layer, and thus placed upon the Serial No. 162,219. (No model.)

conductor. By this means a ire-proof insulation is made Without unduly increasing the diameter ofthe conductor. I prefer to apply the asbestus fibers by means or the machine patented and described in Letters Patent No. 300,403, dated June 17, 1884. and also by the machine for which application for Letters Patent has been made by Henry Splitdorf, Serial No. 255,972, tiled December 5, 1887.

Over the before-mentioned coverings or insulations l may place a covering or Wrapping, b, of cotton, silk, or the like. This latter coving prevents the other insulations troni becominginjnred, besides strengthening the conductor and taking up the Wear upon the same.

It the improved insulated conductor herein shown is attacked by lire or lightning from the exterior, the conductor will not be affected, because the asbestus fibers will prevent the heat reaching the metal. Again, if a current of undue strength passes through the conductor the insulation Will not be destroyed and the conductor will not be injurious to life, because the asbestus will not be aiected thereby.

lt is Well known that asbestus fibers absorb and retain moisture, and that this moisture will oXidiZe the metal of the conductor if brought in contact therewith. By using the rubber or analogous covering B, as described, the moisture is prevented from reaching the metal. Although l have shown the rubber covering 13 as between the conductor A and the asbestus insulation, it may be placed outside of the asbestus. ln this case moisture will be prevented from reaching the asbestus. The first forni is intended for use where the conductor is in danger of attack from external sources, and the latter form Where an increased current in the wire will burn oft ordinary insulation, the rubber covering being protected in both cases.

Having now described my invention, what I claim is- Ar conductor for electrical and other purposes having a covering ot' threads, a, rubber 95 E, asbestus Iibers i), and threads b, all arranged substantially as herein specified.

CLARENCE C. SlBLEY.`

Wfitiiesscs:

T. IE. Bo Unna, Han ar M. TURK, 

